Roger Clark Motorsport 14mm Head Dowel - Suit RCM2902/RCM593 14mm Head StudsRCM's own modified head dowel, for use with our Uprated 14mm heads stud kits RCM2902 & RCM593. Our dowels are each precision cut and opened, which allows them to fit over the shank of the larger 14mm stud, they can then be simply squeezed shut and tapped into place. Each kit includes x4 dowels. A small video demonstrating how to locate them can be seen below.